Those sincere souls who have been submitting for decades to disciples of Srila Prabhupada as spiritual masters, only to be disappointed, need not leave the proven path of Bhakti as revealed by Srila Prabhupada (who is not at all at fault). Because of such disappointments, one may have doubts about success in Krsna consciousness. But the path is not to be abandoned. Instead, under the complete shelter of Srila Prabhupada one will be saved for sure from material existence.
There is no need to get initiated again and again. One can take complete shelter of Srila Prabhupada and the Holy Name, Nama Prabhu. Nama Rupe is independent, as confirmed in Caitanya-caritamrta Madhya lila, Chapter 15, verses 106 through 111 with purports, a must read carefully. These verses and purports clearly indicate that a sincere soul, initiated or not, can take shelter of Srila Prabhupada-vani and Lord Krsna, the Holy Name, directly.
The disappointed disciples of our Godbrothers remain on duty to give Srila Prabhupada's mercy to the suffering masses of conditioned souls on this planet, which is known as Martyaloka or the planet of death. Krsna consciousness is a matter of life and death for everyone. Srila Prabhupada wanted millions, he said "a hundred million" devotees.
Respectful obeisances must go out to all the recently disappointed 1,500+ disciples, with the prayer to please take care to remain disciples under the direct protection of their Param-guru, Srila Prabhupada, who said that the grandfather is more kind to the sons than the father. So be it.